display single topic last page

Hi,
there is a shortcode to display a single topic:
[bbp-single-topic id=$topic_id]
and there is a function to find last reply of the topic:
<?php bbp_last_topic_reply_permalink ?>
Now I want to create a shortcode to show the last reply of the topic.
for example:
[bbp-single-topic-last id=$topic_id]
Please tell me how can I do this.
Thanks